24 results match your criteria cofeo nanoparticles

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Adsorption Performances and Electrochemical Properties of Methyl Blue onto CoFe₂O₄ Nanoparticles.

J Nanosci Nanotechnol 2021 04;21(4):2203-2211

College of Vanadium and Titanium, Panzhihua University, 617000, P. R. China.

Magnetic CoFe₂O₄ nanoparticles were successfully manufactured through the process of nitrate combustion using anhydrous ethanol as fuel, they together with their intermediate were characterized by thermo gravimetric (TG) analysis, selected area electron diffraction (SAED), transmission electron microscope (TEM), vibrating sample magnetometer (VSM), and X-ray diffraction (XRD). These results indicated a phenomenon that the magnetic CoFe₂O₄ nanoparticles could be formed at 400 °C, the average grain size, the specific magnetization, and the specific surface area of magnetic CoFe₂O₄ nanoparticles fabricated at 400 °C for 2 h with 30 mL anhydrous ethanol were corresponding 20 nm, 78.0 Am²/kg and 83. Read More

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Hydrothermal Synthesis of Cobalt Doped Magnetite Nanoparticles for Corrosion Protection of Epoxy Coated Reinforced Steel.

J Nanosci Nanotechnol 2020 06;20(6):3519-3526

Institute for Tropical Technology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Ha Noi 122000, Vietnam.

Magnetite (Fe³O⁴) and Cobalt-doped Fe³O⁴ nanoparticles were obtained by hydrothermal reaction. The synthesized products were characterized by X-ray diffraction, Energy dispersive spectroscopy, Scanning electron microscopy, and Zeta potential. The results show that Co was substituted in the Fe³O⁴ crystal structure as CoFe₂O₄ phase. Read More

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Systematic Study on TiO₂ Crystallization via Hydrothermal Synthesis in the Presence of Different Ferrite Nanoparticles as Nucleation Seeds.

J Nanosci Nanotechnol 2019 08;19(8):4994-4999

Department of Chemistry and Industrial Chemistry, University of Genoa, Genoa 16146, Italy.

In the present work, the crystallization of anatase TiO₂ nanoparticles (NPs), using different ferrite nanoparticles with different chemical composition, dimensions and shape as nucleation seeds, was investigated. In particular, CoFe₂O₄, NiFe₂O₄ and Fe₃O₄ NPs with a volume ratio equal to 1:1000 with respect of TiO₂ amount, were used in order to investigate the synthesis of nanocrystalline tetragonal anatase TiO₂ by a hydrothermal synthesis. In addition, Lu₂O₃ nanoparticles were also used to detect the effect of a non-magnetic nanoparticle on the synthesis and nanocrystallization of titania. Read More

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Electrochemical Synthesis and Magnetic Properties of MFe₂O₄ (M = Fe, Mn, Co, Ni) Nanoparticles for Potential Biomedical Applications.

J Nanosci Nanotechnol 2019 04;19(4):2008-2015

Departamento de Química Física Aplicada, Facultad de Ciencias, Universidad Autónoma de Madrid, Cantoblanco s/n, 28049 Madrid, Spain.

In this study, we evaluate the magnetic properties and cytotoxic effect of magnetic nanoparticles (MNPs) based on magnetite and Mn, Co and Ni ferrites, obtained by electrochemical synthesis. These nanoparticles have almost spherical shape and an mode size of 9±1 nm. The electrochemical synthesis produces a single crystallographic phase with a spinel-like structure in all cases. Read More

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A Mild and Facile Synthesis of Amino Functionalized CoFe₂O₄@SiO₂ for Hg(II) Removal.

Nanomaterials (Basel) 2018 Aug 29;8(9). Epub 2018 Aug 29.

Center for Separation and Purification Materials &Technologies, Suzhou University of Science and Technology, Suzhou 215009, China.

To avoid the dangerous operational conditions, shorten the preparation time, and improve the adsorption performance of amino-functionalized nanomagnetic materials with a core⁻shell structure, a magnetic nanocomposite of CoFe₂O₄@SiO₂ was successfully functionalized with amino group (-NH₂) through a mild and facile hydrothermal method without the use of any toxic or harmful solvents at a relatively low temperature. The preparation time of the key steps of amino functionalization was shortened from 30 h to about 10 h. The core-shell structure and successful grafting were confirmed by various means. Read More

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Synthesis and Properties of Nanosized Stoichiometric Cobalt Ferrite Spinel.

Materials (Basel) 2018 Jul 19;11(7). Epub 2018 Jul 19.

Department of Inorganic Chemistry, Faculty of Chemical Technology, University of Chemistry and Technology, Technická 5, 166 28 Prague 6, Czech Republic.

Nanoparticles with controllable sizes of ferrite spinel CoFe₂O₄ were formed by thermal treatment of cobalt-iron glycerolate. Thermal behavior during the heating was studied by differential thermal analysis combined with thermogravimetry. The precursor, as well as the prepared nanoparticles, were analyzed by a broad spectrum of analytic techniques (X-Ray photoelectron spectroscopy (XPS), X-Ray diffraction (XRD), Energy dispersive spectroscopy (EDS), Atomic absorption spectroscopy (AAS), Scanning electron microscopy (SEM), and Raman spectroscopy). Read More

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Synthesis of Magnetic CoFe₂O₄ Nanoparticles and Their Efficient Degradation of Diclofenac by Activating Persulfate via Formation of Sulfate Radicals.

J Nanosci Nanotechnol 2018 10;18(10):6942-6948

In this study, magnetic CoFe2O4 nanoparticles were synthesized by hydrothermal method by using ferric nitrate and cobalt nitrate as raw materials. Subsequently, physicochemical properties of the resulting CoFe2O4 nanoparticles were systematically studied by scanning electron microscope, X-ray diffraction, N2 adsorption/desorption, Fourier transformation infrared spectroscopy and Vibration sample magnetometer measurement. Results indicated that CoFe2O4 nanoparticles with cubic spinel structure possessed an average diameter of 6. Read More

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October 2018

Construction of a multifunctional nanoprobe for tumor-targeted time-gated luminescence and magnetic resonance imaging in vitro and in vivo.

Nanoscale 2018 Jun;10(24):11597-11603

Shandong Key Laboratory of Functional Nano Materials and Technology, School of Chemistry and Chemical Engineering, Linyi University, Linyi 276005, P. R. China.

A dual-modal fluorescence-magnetic resonance imaging technique has gained tremendous attention for its potential in the dawning era of early diagnosis of tumors with high accuracy. In this study, a facile approach has been developed to prepare a tumor-targetable nanoprobe, PTTA-Eu3+-CoFeO-FA nanoparticles, for dual-modal time-gated luminescence (TGL)-magnetic resonance (MR) imaging of tumor cells in vitro and in vivo. The multifunctional nanoprobe was constructed by coating a tumor-targeting molecule, folic acid (FA), and a luminescent Eu3+ complex, PTTA-Eu3+, onto the surface of cobalt/iron oxide (CoFeO) nanoparticles. Read More

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Facile Synthesis of Efficient Antibacterial Agent as CoFe₂O₄/Ag Composite Material Against Both Gram-Negative and Gram-Positive Bacteria.

J Nanosci Nanotechnol 2018 09;18(9):6348-6354

School of Convergence Materials Science and Engineering, Changwon National University, Changwon City, 51140, South Korea.

We have suggested that a facile synthesis of CoFe2O4/Ag composite material as an antibacterial agent for substitution of a chlorination agent for microbial infected wastewater treatment. The CoFe2O4/Ag was synthesized by an impregnation method in assistance with trisodium citrate as a reducing agent. The as-prepared uncalcined CoFe2O4 (CFG), calcined CoFe2O4 (CFG600), and calcined CoFe2O4/Ag (CFG600/Ag) composites were characterized by X-ray diffraction (XRD), Field Emission Scanning Electron Microscope (FE-SEM) and Energy Dispersive X-ray (EDX) techniques. Read More

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September 2018

Investigation on the Magnetically Separable Zn Substituted CoFe₂O₄ Nanoparticles with Enhanced Photo-Fenton Degradation.

J Nanosci Nanotechnol 2018 Aug;18(8):5354-5366

Department of Physics, Loyola College, Chennai 600034, India.

We report the influence of Co1-xZnxFe2O4 nanoferrites for the photodegradation of organic pollutant present in the aqueous solution. A series of Co1-xZnxFe2O4 (x = 0.01, 0. Read More

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Increased Surface Roughness in Polydimethylsiloxane Films by Physical and Chemical Methods.

Polymers (Basel) 2017 Aug 2;9(8). Epub 2017 Aug 2.

Instituto de Química Física de Materiales, Ambiente y Energía (INQUIMAE), Ciudad Autónoma de Buenos Aires C1428EGA, Argentina.

Two methods, the first physical and the other chemical, were investigated to modify the surface roughness of polydimethylsiloxane (PDMS) films. The physical method consisted of dispersing multi-walled carbon nanotubes (MWCNTs) and magnetic cobalt ferrites (CoFe₂O₄) prior to thermal cross-linking, and curing the composite system in the presence of a uniform magnetic field . The chemical method was based on exposing the films to bromine vapours and then UV-irradiating. Read More

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Optimized Photodynamic Therapy with Multifunctional Cobalt Magnetic Nanoparticles.

Nanomaterials (Basel) 2017 Jun 10;7(6). Epub 2017 Jun 10.

Department of Electrical & Biological Physics, Kwangwoon University, Nowon-gu, Seoul 139-701, Korea.

Photodynamic therapy (PDT) has been adopted as a minimally invasive approach for the localized treatment of superficial tumors, representing an improvement in the care of cancer patients. To improve the efficacy of PDT, it is important to first select an optimized nanocarrier and determine the influence of light parameters on the photosensitizing agent. In particular, much more knowledge concerning the importance of fluence and exposure time is required to gain a better understanding of the photodynamic efficacy. Read More

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Thermal Condensation of Glycine and Alanine on Metal Ferrite Surface: Primitive Peptide Bond Formation Scenario.

Life (Basel) 2017 Mar 27;7(2). Epub 2017 Mar 27.

Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee 247 667, Uttarakhand, India.

The amino acid condensation reaction on a heterogeneous mineral surface has been regarded as one of the important pathways for peptide bond formation. Keeping this in view, we have studied the oligomerization of the simple amino acids, glycine and alanine, on nickel ferrite (NiFe₂O₄), cobalt ferrite (CoFe₂O₄), copper ferrite (CuFe₂O₄), zinc ferrite (ZnFe₂O₄), and manganese ferrite (MnFe₂O₄) nanoparticles surfaces, in the temperature range from 50-120 °C for 1-35 days, without applying any wetting/drying cycles. Among the metal ferrites tested for their catalytic activity, NiFe₂O₄ produced the highest yield of products by oligomerizing glycine to the trimer level and alanine to the dimer level, whereas MnFe₂O₄ was the least efficient catalyst, producing the lowest yield of products, as well as shorter oligomers of amino acids under the same set of experimental conditions. Read More

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Size-Dependent Photodynamic Anticancer Activity of Biocompatible Multifunctional Magnetic Submicron Particles in Prostate Cancer Cells.

Molecules 2016 Sep 6;21(9). Epub 2016 Sep 6.

Plasma Bioscience Research Center, Kwangwoon University, 20 Kwangwoongil, Nowon-gu, Seoul 01897, Korea.

In this study, newly designed biocompatible multifunctional magnetic submicron particles (CoFe₂O₄-HPs-FAs) of well-defined sizes (60, 133, 245, and 335 nm) were fabricated for application as a photosensitizer delivery agent for photodynamic therapy in cancer cells. To provide selective targeting of cancer cells and destruction of cancer cell functionality, basic cobalt ferrite (CoFe₂O₄) particles were covalently bonded with a photosensitizer (PS), which comprises hematoporphyrin (HP), and folic acid (FA) molecules. The magnetic properties of the CoFe₂O₄ particles were finely adjusted by controlling the size of the primary CoFe₂O₄ nanograins, and secondary superstructured composite particles were formed by aggregation of the nanograins. Read More

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September 2016

Synthesis and Characterization of Zirconium Substituted Cobalt Ferrite Nanopowders.

J Nanosci Nanotechnol 2016 Jan;16(1):851-5

Nanocrystalline ferrites; CoFe₂O₄ (CFO) and CoFe₁.₉Zr₀.₁O₄ (CFZO) have been synthesized through chemical coprecipitation method. Read More

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January 2016

Temperature-Dependent Magnetic Response of Antiferromagnetic Doping in Cobalt Ferrite Nanostructures.

Nanomaterials (Basel) 2016 Apr 18;6(4). Epub 2016 Apr 18.

Centre for excellence in Solid State Physics, University of the Punjab, Lahore 54000, Pakistan.

In this work MnCoFe₂O₄ nanoparticles (NPs) were synthesized using a chemical co-precipitation method. Phase purity and structural analyses of synthesized NPs were performed by X-ray diffractometer (XRD). Transmission electron microscopy (TEM) reveals the presence of highly crystalline and narrowly-dispersed NPs with average diameter of 14 nm. Read More

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Structural and Magnetic Response in Bimetallic Core/Shell Magnetic Nanoparticles.

Nanomaterials (Basel) 2016 Apr 14;6(4). Epub 2016 Apr 14.

Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.

Bimagnetic monodisperse CoFe₂O₄/Fe₃O₄ core/shell nanoparticles have been prepared by solution evaporation route. To demonstrate preferential coating of iron oxide onto the surface of ferrite nanoparticles X-ray diffraction (XRD), High resolution transmission electron microscope (HR-TEM) and Raman spectroscopy have been performed. XRD analysis using Rietveld refinement technique confirms single phase nanoparticles with average seed size of about 18 nm and thickness of shell is 3 nm, which corroborates with transmission electron microscopy (TEM) analysis. Read More

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Nickel-doped cobalt ferrite nanoparticles: efficient catalysts for the reduction of nitroaromatic compounds and photo-oxidative degradation of toxic dyes.

Nanoscale 2014 Jul;6(14):7959-70

Department of Chemistry, Panjab University, Chandigarh, India-160 014.

This study deals with the exploration of NixCo₁-xFe₂O₄ (x = 0.0, 0.2, 0. Read More

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Faraday rotation of cobalt ferrite nanoparticle polymer composite films at cryogenic temperatures.

Appl Opt 2014 Apr;53(10):2087-92

This paper investigates the behavior of the Verdet constant for cobalt ferrite (CoFe₂O₄) nanoparticles polymer composite films at low temperatures using a 532 nm laser source. An experimental setup for Faraday rotation (FR) at low temperatures is introduced and FRs were measured at various temperatures. Verdet constants were deduced from the paramagnetic model for terbium gallium garnet glass where ~4× improvement was observed at 40° K for CoFe₂O₄ composite film. Read More

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Synthesis Characterization and Photocatalytic Studies of Cobalt Ferrite-Silica-Titania Nanocomposites.

Nanomaterials (Basel) 2014 Apr 23;4(2):331-343. Epub 2014 Apr 23.

School of Chemistry and CRANN, Trinity College Dublin, Dublin 2, Ireland.

In this work, CoFe₂O₄@SiO₂@TiO₂ core-shell magnetic nanostructures have been prepared by coating of cobalt ferrite nanoparticles with the double SiO₂/TiO₂ layer using metallorganic precursors. The Transmission Electron Microscopy (TEM), Energy Dispersive X-Ray Analysis (EDX), Vibrational Sample Magnetometer (VSM) measurements and Raman spectroscopy results confirm the presence both of the silica and very thin TiO₂ layers. The core-shell nanoparticles have been sintered at 600 °C and used as a catalyst in photo-oxidation reactions of methylene blue under UV light. Read More

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Oleylamine as a beneficial agent for the synthesis of CoFe₂O₄ nanoparticles with potential biomedical uses.

Dalton Trans 2014 May;43(17):6377-88

Department of Inorganic Chemistry, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece.

The multifunctional role of oleylamine (OAm) as a versatile and flexible reagent in synthesis as well as a desired surface ligand for the synthesis of CoFe2O4 nanoparticles (NPs) is described. CoFe2O4 NPs were prepared by a facile, reproducible and scalable solvothermal approach in the presence of pure OAm. By monitoring the volume of OAm, different shapes of NPs, spherical and truncated, were formed. Read More

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Magneto-electric nanoparticles to enable field-controlled high-specificity drug delivery to eradicate ovarian cancer cells.

Sci Rep 2013 Oct 16;3:2953. Epub 2013 Oct 16.

1] Center for Personalized NanoMedicine, Department of Immunology, Herbert Wertheim College of Medicine, Florida International University, Miami, Florida 33199 [2] Electrical and Computer Engineering, College of Engineering, Florida International University, Miami, Florida 33174.

The nanotechnology capable of high-specificity targeted delivery of anti-neoplastic drugs would be a significant breakthrough in Cancer in general and Ovarian Cancer in particular. We addressed this challenge through a new physical concept that exploited (i) the difference in the membrane electric properties between the tumor and healthy cells and (ii) the capability of magneto-electric nanoparticles (MENs) to serve as nanosized converters of remote magnetic field energy into the MENs' intrinsic electric field energy. This capability allows to remotely control the membrane electric fields and consequently trigger high-specificity drug uptake through creation of localized nano-electroporation sites. Read More

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October 2013

Cellular internalization of dissolved cobalt ions from ingested CoFe₂O₄ nanoparticles: in vivo experimental evidence.

Environ Sci Technol 2013 May 1;47(10):5400-8. Epub 2013 May 1.

Department of Biology, Biotechnical Faculty, University of Ljubljana, Večna pot 111, 1000 Ljubljana, Slovenia.

With a model invertebrate animal, we have assessed the fate of magnetic nanoparticles in biologically relevant media, i.e., digestive juices. Read More

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Polymer nanocomposites exhibiting magnetically tunable microwave properties.

Nanotechnology 2011 Apr 22;22(13):135602. Epub 2011 Feb 22.

Integrated Functional Materials Group, Department of Physics, University of South Florida, Tampa, FL 33620, USA.

Polymer nanocomposites (PNCs) have been synthesized using Rogers polymer and CoFe₂O₄ nanoparticles (CFO NPs). X-ray diffraction (XRD) confirms the inverse spinel crystal structure of CFO NPs and transmission electron microscopy (TEM) images show the uniform dispersion of nanoparticles (10 nm ± 1) into the polymer matrix. Magnetic measurements indicate superparamagnetic response near room temperature for all PNCs. Read More

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